High Bilirubin in Cats (Jaundice): Causes, Treatment & What to Expect
Last updated: October 2026
Quick Answer: Cat Bilirubin Levels
Normal bilirubin: 0.1-0.3 mg/dL. Hepatic lipidosis (fatty liver) is the #1 cause of jaundice in cats — and with early comprehensive treatment, about 75-80% of cats recover. If your cat has stopped eating and is turning yellow, this is likely the cause.
Seeing your cat turn yellow is frightening. Jaundice means bilirubin is building up in your cat's body — but many causes are treatable, especially when caught early. This guide explains what's happening and what to expect.
Have your cat's bloodwork results?
Upload to see how bilirubin relates to liver enzymes. High ALP with normal GGT often points to hepatic lipidosis — a pattern that helps guide treatment.
Analyze My Cat's BloodworkWhat Is Bilirubin?
Bilirubin is a yellow pigment created when red blood cells break down. Normally, the liver processes bilirubin and excretes it in bile. When this process is disrupted, bilirubin accumulates in the blood and tissues, causing the characteristic yellow color of jaundice.
Important for cats: Unlike dogs, cats should never have bilirubin in their urine. If your cat's urinalysis shows any bilirubin, it confirms elevated blood levels and warrants immediate investigation.
Bilirubin Levels: What the Numbers Mean
| Bilirubin Level | Severity | Appearance | Action |
|---|---|---|---|
| 0.1-0.3 mg/dL | Normal | No jaundice | No action needed |
| 0.4-2.0 mg/dL | Mild-Mod | Subtle to visible yellowing | See vet within 24 hours |
| 2.0-5.0 mg/dL | Moderate | Obvious jaundice | Urgent — hospitalization often needed |
| 5.0-10.0 mg/dL | High | Deep yellow/orange | Intensive care needed |
| >10 mg/dL | Severe | Intense yellow | Emergency — may need surgery |
The Most Common Cause: Hepatic Lipidosis
Why This Happens to Cats
Hepatic lipidosis (fatty liver disease) is the #1 cause of jaundice in cats. When a cat stops eating — for any reason — their body mobilizes fat for energy. In cats, this fat can overwhelm the liver, causing it to fail.
Key point: Just 2-3 days of not eating can trigger this, especially in overweight cats. This is why any cat that hasn't eaten for 24-48 hours needs veterinary attention.
The good news: With comprehensive treatment — a feeding tube plus addressing whatever stopped the cat eating — about 75-80% of cats with hepatic lipidosis recover fully. Feeding alone, without treating the underlying trigger, roughly halves that.
Diagnostic Clue: ALP and GGT Pattern
Other Causes of Jaundice in Cats
Need help understanding your cat's results?
Upload your cat's bloodwork to see the pattern. High ALP with normal GGT suggests hepatic lipidosis. Elevated ALT and GGT together may indicate cholangitis.
Analyze My Cat's ResultsSigns of Jaundice in Cats
Check these areas for yellow discoloration:
- • Whites of the eyes (sclera) — often the first place to notice
- • Gums and inside of lips — should be pink, not yellow
- • Inner ear flaps — thin skin shows color changes
- • Belly or inner thighs — where fur is sparse
Other signs that often accompany jaundice:
- • Not eating (anorexia) — often the first sign, especially with hepatic lipidosis
- • Lethargy — sleeping more, less interested in surroundings
- • Weight loss — can be rapid
- • Vomiting — especially with pancreatitis or liver inflammation
- • Dark yellow or orange urine — bilirubin in urine
- • Hiding — cats hide when they feel unwell
Jaundice in Cats: Survival Rate by Cause
There is no single survival rate for jaundice, and any source that gives you one number is answering the wrong question. Jaundice is a sign that bilirubin has built up — it is not a disease, and the figure you actually want depends entirely on which of the causes below your vet has confirmed. The spread is wide: some of these are curable, others are not.
- Hepatic Lipidosis: Roughly 75-80% of even severely affected cats survive with comprehensive care, against about 50% when nutritional support is the only treatment given — the difference is treating the underlying trigger, not just the feeding. Tube feeding commonly runs 6-7 weeks. The disease either resolves within about 14-21 days or it does not; cats do not survive it chronically.
- Cholangitis/Cholangiohepatitis: Variable depending on type. Neutrophilic (bacterial) often responds well to antibiotics. Lymphocytic may need long-term steroids.
- Pancreatitis-related obstruction: Often improves with treatment of pancreatitis. May take days to weeks.
- FIP: Historically poor prognosis, but new antiviral treatments (GS-441524) show promising results.
- Mycoplasma haemofelis: Usually responds well to antibiotics (doxycycline). Good prognosis.
- Liver cancer: Depends on type and spread. Some primary liver tumors are surgically removable.
Key Point
The most common cause of jaundice in cats — hepatic lipidosis — is also one of the most treatable. With early, aggressive nutritional support, most cats recover. Don't wait to seek care.
How Long Can a Cat Live with Jaundice?
Long enough to recover completely, or days — and which one it is depends on how fast the cause is found, not on the bilirubin number itself.
- • Untreated hepatic lipidosis: usually fatal within days to weeks, because the cat is not eating and the liver cannot keep up with the fat being mobilised.
- • Treated hepatic lipidosis: most cats recover fully. Expect a feeding tube for 6-7 weeks; cats that come through it generally return to a normal lifespan.
- • Bacterial cholangitis or Mycoplasma haemofelis: days to weeks to turn around on antibiotics, with a good long-term outlook.
- • Lymphoma or biliary cancer: typically weeks to months, extended by chemotherapy.
- • Bile duct obstruction: depends on whether it can be relieved surgically; guarded until it is.
The reason urgency matters so much here is that jaundice is a late sign. Yellowing only becomes visible once bilirubin is roughly above 2 mg/dL, which means the underlying disease was already established before you could see it. A cat that is jaundiced and not eating should be seen the same day, not monitored overnight.
Treatment Approach
Treatment depends on the underlying cause:
- Hepatic Lipidosis: Feeding tube (esophagostomy or nasogastric tube), liver support (SAMe, ursodiol), anti-nausea medications, IV fluids. Feeding must be aggressive — calories matter.
- Cholangitis: Antibiotics for bacterial infection, immunosuppressants for lymphocytic type, ursodiol for bile flow.
- Pancreatitis: Pain management, anti-nausea medications, IV fluids, nutritional support.
- IMHA: Immunosuppressive medications, blood transfusions if needed.
- All jaundiced cats: Often receive vitamin K (important for clotting), IV fluids, and supportive care.
When to Seek Emergency Care
Go to the emergency vet if:
- Your cat hasn't eaten in 48+ hours (risk of hepatic lipidosis)
- Gums are pale or white (severe anemia)
- Your cat is very weak or collapsed
- There's severe vomiting or diarrhea
- You notice difficulty breathing
- Jaundice appeared very suddenly
- Your cat has a swollen abdomen
See regular vet within 24 hours if:
- Mild jaundice noticed but cat is still eating (even reduced amounts)
- Cat is alert and moving around
- No vomiting or diarrhea
Even mild jaundice in cats always requires veterinary evaluation — but if your cat is stable, you can wait for a morning appointment.
Reference: Bilirubin, Cornell University eClinPath.
Related Reading
Understand Your Cat's Liver Values
Upload your cat's bloodwork to VetLens and instantly see:
- ✓ How bilirubin relates to ALT, ALP, and GGT
- ✓ Pattern recognition (hepatic lipidosis vs cholangitis vs obstruction)
- ✓ Red blood cell status if anemia is suspected
- ✓ Questions to ask your vet
Frequently Asked Questions
What is a normal bilirubin level in cats?
Normal total bilirubin in cats ranges from 0.1-0.3 mg/dL. Unlike dogs, any bilirubin in cat urine is abnormal and warrants investigation. Visible jaundice typically appears once bilirubin exceeds about 2 mg/dL, so a yellow cat is never an early finding.
What is the most common cause of jaundice in cats?
Hepatic lipidosis (fatty liver disease) is the most common cause of jaundice in cats. It occurs when a cat stops eating and fat accumulates in the liver. Other common causes include cholangitis, pancreatitis-related bile duct obstruction, lymphoma, FIP, and Mycoplasma haemofelis.
What is the survival rate for jaundice in cats?
There is no single survival rate for jaundice, because jaundice is a sign rather than a disease — the number depends entirely on what is causing it. Hepatic lipidosis, the most common cause, carries roughly 75-80% survival with comprehensive treated with aggressive nutritional support via a feeding tube. Bacterial cholangitis and Mycoplasma haemofelis usually respond well to antibiotics. Lymphoma and biliary cancer carry a much poorer outlook. Ask your vet which cause has been confirmed before applying any figure.
How long can a cat live with jaundice?
Jaundice itself does not have a life expectancy; the underlying cause sets it. Untreated hepatic lipidosis is usually fatal within days to weeks, because the cat is not eating. With a feeding tube and supportive care, most cats recover fully and go on to a normal lifespan. Cats with lymphoma or biliary cancer typically have weeks to months, extended by chemotherapy. The single biggest variable is how quickly the cause is identified and treated.
Can a cat recover from jaundice?
Yes. Jaundice from hepatic lipidosis, bacterial cholangitis, Mycoplasma haemofelis, or a resolving pancreatitis is frequently reversible, and the liver has substantial regenerative capacity. Recovery depends on treating the cause quickly rather than on the bilirubin number itself.
Is jaundice in cats curable?
It depends on the cause. Hepatic lipidosis is genuinely curable — cats that recover usually do not relapse once the reason they stopped eating is resolved. Bacterial cholangitis and Mycoplasma haemofelis are curable with antibiotics. Lymphocytic cholangitis is managed long-term rather than cured. Cancer and end-stage liver fibrosis are not curable, though treatment can extend comfortable time.
How long does jaundice take to resolve in cats?
Bilirubin falls over days to weeks once the cause is under control, not overnight. Cats with hepatic lipidosis commonly need a feeding tube for 6-7 weeks, with visible yellowing fading well before the tube comes out. Jaundice that is not improving after one to two weeks of treatment means the cause needs re-investigating.
Why is my cat not eating and turning yellow?
This combination points strongly at hepatic lipidosis. A cat that stops eating mobilises body fat faster than the liver can process it, fat accumulates in liver cells, and bilirubin clearance fails — producing jaundice. It is self-reinforcing, because nausea from liver dysfunction further suppresses appetite. This is an emergency, not something to monitor at home.
Is jaundice in cats always fatal?
No. The most common cause in cats is also one of the most treatable. What makes jaundice dangerous is delay: by the time yellowing is visible, bilirubin is already well above normal and the underlying disease is established.
What does it mean if my cat has bilirubin in their urine?
Any bilirubin in feline urine is abnormal. Dogs can have small amounts normally, cats cannot, so bilirubinuria in a cat warrants investigation of the liver and red blood cells even when the cat looks well.